fix(graphql): type helpers metadata inheriting

Yarn PnP doesn't implicitly inherit transitive peer dependencies class-validator and class-transformer from @nestjs/mapped-types.

Fixes nestjs#2169.

package.json

@@ -66,11 +66,19 @@
     "@fastify/static": "^6.0.0",
     "@nestjs/common": "^9.0.0",
     "@nestjs/core": "^9.0.0",
+    "class-transformer": "*",
+    "class-validator": "*",
     "reflect-metadata": "^0.1.12"
   },
   "peerDependenciesMeta": {
     "@fastify/static": {
       "optional": true
+    },
+    "class-transformer": {
+      "optional": true
+    },
+    "class-validator": {
+      "optional": true
     }
   },
   "lint-staged": {